One of the biggest changes to the way we live has been the big increase in the number of people who live alone.
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The reality of feeling alone is not what many people think. Claudia Hammond, who instigated a survey called the BBC Loneliness Experiment, explores five counterintuitive findings.
The charity Campaign to End Loneliness says that one million of us are already suffering from acute loneliness, while two and a half million over 60s fear they could end up similarly isolated.